Warp tying machine

ABSTRACT

A warp tying machine comprises a machine body, old and new warp yarn gripping means projecting from the body for gripping old and new warp yarns in side by side positions, and lease rods positioned below the yarn gripping means and projecting from the machine body in the same direction for guiding the warp yarns in movement toward the machine body. Yarn drawing means movable along the lease rods are provided for drawing old and new warps along the lease rods toward the machine body to stand-by positions. A yarn drawing hook is mounted on the machine body and movable in a path of revolution around the machine body, such path including the stand-by positions. Yarn cutting means are provided on the body and include means movable around the warp yarns when they are in the stand-by positions for engaging the yarns and positive action cutting means for cutting the engaged yarns. Yarn tying means are provided on the body along the path of the yarn drawing hook for receiving the old and new warp yarns which have been cut and for tying them together. A yarn presence detecting means is provided for detecting the presence of the yarns in the stand-by positions and for blocking movement of the machine when a yarn is not detected in either position.

United States Patent 1191 Mizuno Apr. 29, 1975 i 1 WARP TYING MACHINE[76] Inventor: Kazuo Mizuno, 3-17-2 Mikasadori, Kasamatsu-cho,Hashima-gun, Gifu Prefecture, Japan [22] Filed: Dec. 13, 1973 [2]] Appl.No: 424,310

Primary E.run1iner Louis K. Rimrodt Attorney. Agent. or Firm-Wenderoth.Lind & Ponack [57] ABSTRACT A warp tying machine comprises a machinebody, old and new warp yarn gripping means projecting from the body forgripping old and new warp yarns in side by side positions, and leaserods positioned below the yarn gripping means and projecting from themachine body in the same direction for guiding the warp yarns inmovement toward the machine body, Yarn drawing means movable along thelease rods are provided for drawing old and new warps along the leaserods toward the machine body to stand-by positions. A yarn drawing hookis mounted on the machine body and movable in a path of revolutionaround the machine body, such path including the stand-by positions Yarncutting means are provided on the body and include means movable aroundthe warp yarns when they are in the stand-by positions for engaging theyarns and positive action cutting means for cutting the engaged yarns.Yarn tying means are provided on the body along the path of the yarndrawing hook for receiving the old and new warp yarns which have beencut and for tying them together, A yarn presence detecting means isprovided for detecting the presence of the yarns in the stand-bypositions and for blocking movement of the machine when a yarn is notdetected in either position.

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1. A warp tying machine comprising a machine body, old and new warp yarngripping means projecting from said body for gripping old and new warpyarns in side by side positions, lease rod means positioned below saidyarn gripping means and projecting from the machine body in the samedirection for guiding the warp yarns in movement toward said machinebody, yarn drawing means movable along said least rod means for drawingold and new warps along said lease rod means toward said machine body tostand-by positions, a yarn drawing hook mounted on said machine body andmovable in a path of revolution around said machine body, said pathincluding said stand-by positions, yarn cutting means on said bodyhaving means movable around said warp yarns when they are in thestand-by positions for engaging said yarns and positive action cuttingmeans for cutting the engaged yarns, yarn tying means on said body alongthe path of said yarn drawing hook for receiving the old and new warpyarns which have been cut and tying them together, a first yarndetecting device having detecting elements projecting from said machinebody for detecting whether the advance of the machine toward the old andnew warp yarns has reached the positions of such yarns and means coupledto said detecting elements for stopping advance of said machine onlywhen both an old and a new warp yarn have been detected, and a secondyarn detecting means having feeler means projecting from said machinebody for detecting the presence of said yarns in said stand-by positionsand having means actuated by said feeler means for blocking movement ofsaid machine when a yarn is not detected in either position.
 2. A warptying machine as claimed in claim 1 further comprising means for drivingsaid machine along rails in a direction to engage warp yarns, includingratchet and pawl means and said detecting elements comprise detectorsfor engaging the old and new warp yarns, and said means for stopping theadvance of said machine comprise lever means coupled with said detectorsand engaging the pawl means of said ratchet and pawl means fordisengaging said ratchet and pawl means when Said detectors engage ayarn, whereby said machine is advanced until both detectors have engagedyarns and said detectors holding said yarns in said stand-by positionswhen the advance of said machine is stopped.
 3. A warp tying machine asclaimed in claim 1 in which said feeler means of said second yarndetecting means comprises a pair of feelers projecting into thepositions of the old and the new warp yarns in the stand-by positionsthereof, and said means actuated by said feeler means comprises movablemembers and blocking means engaged by said movable members unless saidmovable members have been moved by the action of said feelers inengaging yarns.
 4. A warp tying machine as claimed in claim 3 in whichsaid means actuated by said feelers comprises a freely slidable rodcoupled with each of said feelers, guide plates in which said slidablerods are guided for sliding movement, rotatable cam and pawl meanscoupled with the remainder of said machine and rotatable during theoperation of said machine, a blocking pawl lever for each slidable rodand in the rest position of said machine engaged with said rotatable camand pawl means for blocking rotation thereof, and pawl lever controlplates on said slidable rods for engaging said slidable rods on movementthereof and disengaging them from said rotatable cam and pawl means whensaid feelers are engaged by warp yarns in the stand-by positionsthereof, whereby when said feelers detect yarns, the slidable rods aremoved to free said rotatable cam and pawl means and the machine cancontinue its operation, and when one or the other of said feelers failsto detect a yarn, the slidable rod does not move and the blocking pawllever is not disengaged from said rotatable cam and pawl means, and thefurther movement of said machine is blocked.
 5. A warp tying machine asclaimed in claim 1 in which said lease rod means comprises a pluralityof pairs of lease rods mounted one above the other, each lease rod beingmounted for rotation around the longitudinal axis thereof back and forththrough one-half revolution and a push rod slidably mounted on each ofsaid lease rods for sliding movement therealong for pushing warp yarnspassing over the lease rods away from said machine body and leaving theclosest warp yarns free to be engaged by said yarn drawing means.
 6. Awarp tying machine as claimed in claim 5 in which the push rods on eachpair of lease rods are on opposite sides of the lease rods so that thepush rods are opposed to each other in one rotational position of thepush rods and the push rods on the next lower pair of push rods to agiven pair of push rods are on the opposite sides of the push rods fromthe push rods in said given pair.
 7. A warp tying machine as claimed inclaim 1 in which said yarn cutting means comprises a hook arm rotatablymounted on said machine for rotation in a path which carries said hookarm around the yarns in said stand-by positions, a fixed blade on saidhook arm, a movable blade pivotally mounted on said hook arm at aposition to cooperate with said fixed blade on said hook arm, and a camon said machine for engaging and pivoting said pivotally mounted bladefor pivoting for positively cutting said warp yarns engaged by said hookarm during its rotation.
 8. A warp tying machine as claimed in claim 1in which said machine has a disc rotatably mounted on the bottom of saidmachine body, an arm on said disc extending upwardly along said body,said yarn drawing hook being mounted on the end of said arm, said yarnhook having yarn grooves thereon for engaging the old warp and the newwarp separately for drawing them to the yarn tying means.
 9. A warptying machine as claimed in claim 1 in which said yarn tying meanscomprises a hook guide cylinder rotatably and slidably mounted on saidmachine for sliding movement in the direction of its length, means forrotating said cylinder and for moving it back and forth in the directionof its length, a withdrawal hook member within said cylinder aNd havinga hook on the end thereof over which said cylinder is movable, and aguide piece on the end of said cylinder for engaging the warp yarns andwrapping them around the guide cylinder and drawing them into the hookon the end of said hook member during rotation of said cylinder.
 10. Awarp tying machine as claimed in claim 1 further comprising a clipper onsaid body along the path of said yarn drawing hook just past said yarntying means, a yarn end receiving box on said body along the path ofsaid yarn drawing hook just past said clipper, and yarn end disposalmeans on said box for positively gripping the ends of the warp yarnsbeing tied as they are cut by said clipper and positively deliveringthem into the yarn end receiving box.
 11. A warp tying machine asclaimed in claim 10 in which said yarn end disposal means comprisesupper and lower grip pawls having interfitting teeth thereon pivotallymounted above said box, means for opening said grip pawls duringadvancement of the yarn by said yarn drawing hook, and means forpositively closing said grip pawls during the action of said clipperwhile said yarn ends are clipped, and means for opening said grip pawlsand pivoting them downwardly toward said box after said slipper has cutthe yarns.
 12. A warp tying machine as claimed in claim 1 in which saidold and new warp yarn gripping means each comprises a clip member and apressing plate having one end of the clip member pivoted thereto, andfastening means on the other ends of said clip member and said pressingplate and comprising a fastener member and a pair of connecting rodspivoted thereto and having a space therebetween and having the otherends thereof pivoted on said clip member, a clip lever having one endpivotally mounted on said fastener member and having a cam portionadjacent the pivoted end thereof, and a plate spring on the other end ofthe pressing plate which fits between said connecting rods and againstwhich said cam portion bears when said fastener member is engaged withthe end of said pressing plate and said clip lever is pivoted toward andagainst said plate spring.